defineSuite([
        'Core/LinearSpline',
        'Core/Cartesian3'
    ], function(
        LinearSpline,
        Cartesian3) {
    'use strict';

    var points;
    var times;

    beforeEach(function() {
        points = [
            new Cartesian3(-1.0, -1.0, 0.0),
            new Cartesian3(-0.5, -0.125, 0.0),
            new Cartesian3(0.5, 0.125, 0.0),
            new Cartesian3(1.0, 1.0, 0.0)
        ];
        times = [0.0, 1.0, 2.0, 3.0];
    });

    it('constructor throws without points or times', function() {
        expect(function() {
            return new LinearSpline();
        }).toThrowDeveloperError();
    });

    it('constructor throws when control points length is less than 2', function() {
        expect(function() {
            return new LinearSpline({
                points : [Cartesian3.ZERO]
            });
        }).toThrowDeveloperError();
    });

    it('constructor throws when times.length is not equal to points.length', function() {
        expect(function() {
            return new LinearSpline({
                points : points,
                times : [0.0, 1.0]
            });
        }).toThrowDeveloperError();
    });

    it('evaluate throws without time', function() {
        var ls = new LinearSpline({
            points : points,
            times : times
        });

        expect(function() {
            ls.evaluate();
        }).toThrowDeveloperError();
    });

    it('evaluate throws when time is out of range', function() {
        var ls = new LinearSpline({
            points : points,
            times : times
        });

        expect(function() {
            ls.evaluate(times[0] - 1.0);
        }).toThrowDeveloperError();
    });

    it('evaluate without result parameter', function() {
        var ls = new LinearSpline({
            points : points,
            times : times
        });

        expect(ls.evaluate(times[0])).toEqual(points[0]);

        var time = (times[1] + times[0]) * 0.5;
        var t = (time - times[0]) / (times[1] - times[0]);
        expect(ls.evaluate(time)).toEqual(Cartesian3.lerp(points[0], points[1], t, new Cartesian3()));
    });

    it('evaluate with result parameter', function() {
        var ls = new LinearSpline({
            points : points,
            times : times
        });
        var result = new Cartesian3();

        var point = ls.evaluate(times[0], result);
        expect(point).toBe(result);
        expect(result).toEqual(points[0]);
    });
});
